MRA Statistical Techniques & Data Interpretation

Question 1

Which measure represents the average value in a data set?

Accepted Answer

Mean

Answer

The mean, also known as the average, is calculated by summing all the values in a dataset and dividing by the number of values. It is the most commonly used measure of central tendency, representing the typical or central value of a distribution. While mode and median are also measures of central tendency, the mean specifically refers to the arithmetic average.

Question 2

What does standard deviation measure in a dataset?

Accepted Answer

Spread of the data

Answer

Standard deviation is a measure of the dispersion or variability of a dataset. It quantifies the average amount by which individual data points deviate from the mean of the dataset. A low standard deviation indicates that data points tend to be close to the mean, while a high standard deviation suggests that data points are spread out over a wider range of values.

Question 3

Which statistical test compares means between two groups?

Accepted Answer

T-test

Answer

A t-test is a statistical hypothesis test used to determine if there is a significant difference between the means of two groups. It is commonly employed when comparing two sample means to infer whether they come from populations with different means. ANOVA (Analysis of Variance) is used for comparing means of three or more groups, while Chi-square tests for associations between categorical variables, and regression analysis examines relationships between variables.

Question 4

What type of variable is 'customer satisfaction rating on a 1-5 scale'?

Accepted Answer

Ordinal

Answer

An ordinal variable is a categorical variable where the categories have a natural order or ranking, but the differences between the categories are not necessarily equal or meaningful. A customer satisfaction rating on a 1-5 scale (e.g., 1=Very Dissatisfied, 5=Very Satisfied) clearly shows an order of satisfaction, but the difference between a 3 and a 4 might not be the same as the difference between a 4 and a 5.

Question 5

Which chart is best for showing the distribution of a single continuous variable?

Accepted Answer

Histogram

Answer

A histogram is a graphical representation that displays the distribution of a single continuous variable. It uses bars to show the frequency of data points falling within specific intervals or bins. This chart is excellent for visualizing the shape, spread, and central tendency of continuous data, making it easy to identify patterns like skewness or modality.

(MRA) Market Research Analyst Certification Practice Test

(MRA) Market Research Analyst Certification Practice Test

MRA Statistical Techniques & Data Interpretation